sw-precache not updating and taking only cached data - caching

Question

Iam trying to implement networkfirst strategy using sw-precache.
Now iam able to cache the data and able to serve from offline. If i change the data (i.e: changed the header from 'hello' to 'Welcome') in page not get reflecting it always taking the data from the cache its getting update only if i unregistered the service worker or clear the site data then only i can get my data
Here is my sw-precache gulp task :
gulp.task('generate-service-worker', function(callback) {
var path = require('path');
var swPrecache = require('sw-precache');
var rootDir = '.';
swPrecache.write(path.join(rootDir, 'sw.js'), {
staticFileGlobs: [
rootDir + '/css/**.css',
rootDir + '/js/**/*.{js,css}',
rootDir + '/images/**/*.{png,jpg,jpeg}',
rootDir + '/*.{html,js}',
],
runtimeCaching: [
{
urlPattern: 'http://localhost:8080',
handler: 'networkFirst'
}],
stripPrefix: rootDir
}, callback);
});

Answer 1

Two things to check:
Ensure that you're not caching your sw.js file, as this could delay updates for up to 24 hours in Chrome. (Details.)
You're checking for updating content on the subsequent visit to the site following your update? Because of the cache-first strategy, the initial visit to the site following the update won't show the new content (because the cache has been updated "in the background").